Then, in this case I only "can to access" this fields in the class com.extjs.gxt.ui.client.widget.form.ComboBox? Is equal the control access on Java...
Consequently the widget XComboBox is not working?

XComboBox inside GridEditor

XComboBox inside GridEditor

Please let me know how to integrate XComboBox inside GridEditor.
I have used the CellEditor in which the preprocessor method returns model value,but in this case i need to return the list of model values.Its urgent.Please provide the feedback ASAP